I am a 42 year old female with a past significant history of asthma. My enviromental allergies are negligible. For the past 3 1/2 months, I have been had significant congestion of my left sinus. I have been experiencing tenderness to palpation along my left nostril extending to my forehead. I have had my left nostril blocked with a thick mucous that is a dark yellowish to brown colour. I have not had any postnasal drip. My right nostril is clear and I can feel the passage of air. I have tried 2 different types of antibiotics and steroidal nasal sprays. I have a very nasal intonation. I have no resolve. Please advise on the possible causes and relief strategies.